Post Office Locations in ALTON, IL

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We have detailed information for 3 Post Offices and USPS locations in ALTON, IL. Please select the location you are interested in to view lobby and retail hours, directions, services, and reviews.

ALTON POST OFFICE
2350 HOMER M ADAMS PKWY

ALTON SQUARE POST OFFICE
117 ALTON SQ

UPPER ALTON POST OFFICE
1624 MAIN ST